1213918156 has 24 divisors (see below), whose sum is σ = 2356764480. Its totient is φ = 542427600.

The previous prime is 1213918093. The next prime is 1213918171. The reversal of 1213918156 is 6518193121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231210 + ... + 236401.

It is an arithmetic number, because the mean of its divisors is an integer number (98198520).

Almost surely, 2^1213918156 is an apocalyptic number.

It is an amenable number.

1213918156 is a deficient number, since it is larger than the sum of its proper divisors (1142846324).

1213918156 is a wasteful number, since it uses less digits than its factorization.

1213918156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467685 (or 467683 counting only the distinct ones).

The product of its digits is 12960, while the sum is 37.

The square root of 1213918156 is about 34841.3282754834. The cubic root of 1213918156 is about 1066.7511891790.

The spelling of 1213918156 in words is "one billion, two hundred thirteen million, nine hundred eighteen thousand, one hundred fifty-six".